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@ -1,53 +1,58 @@
<p align="center"> <p align="center">
<img <img src="https://user-images.githubusercontent.com/6550035/46709024-9b23ad00-cbf6-11e8-9fb2-ca8b20b7dbec.jpg" width="408px" border="0" alt="croc">
src="https://user-images.githubusercontent.com/6550035/46709024-9b23ad00-cbf6-11e8-9fb2-ca8b20b7dbec.jpg" <br>
width="408px" border="0" alt="croc"> <a href="https://github.com/schollz/croc/releases/latest">
<br> <img src="https://img.shields.io/github/v/release/schollz/croc" alt="Version">
<a href="https://github.com/schollz/croc/releases/latest"><img src="https://img.shields.io/badge/version-v10.2.1-brightgreen.svg?style=flat-square" alt="Version"></a> </a>
<a href="https://github.com/schollz/croc/actions/workflows/ci.yml"><img <a href="https://github.com/schollz/croc/actions/workflows/ci.yml">
src="https://github.com/schollz/croc/actions/workflows/ci.yml/badge.svg" alt="Build <img src="https://github.com/schollz/croc/actions/workflows/ci.yml/badge.svg" alt="Build Status">
Status"></a> </a>
<p align="center">This project is supported by <a href="https://github.com/sponsors/schollz">Github sponsors</a>.</p> </p>
<p align="center">
This project is supported by <a href="https://github.com/sponsors/schollz">GitHub sponsors</a>.
</p>
## About
`croc` is a tool that allows any two computers to simply and securely transfer files and folders. AFAIK, *croc* is the only CLI file-transfer tool that does **all** of the following: `croc` is a tool that allows any two computers to simply and securely transfer files and folders. AFAIK, *croc* is the only CLI file-transfer tool that does **all** of the following:
- allows **any two computers** to transfer data (using a relay) - Allows **any two computers** to transfer data (using a relay)
- provides **end-to-end encryption** (using PAKE) - Provides **end-to-end encryption** (using PAKE)
- enables easy **cross-platform** transfers (Windows, Linux, Mac) - Enables easy **cross-platform** transfers (Windows, Linux, Mac)
- allows **multiple file** transfers - Allows **multiple file** transfers
- allows **resuming transfers** that are interrupted - Allows **resuming transfers** that are interrupted
- local server or port-forwarding **not needed** - No need for local server or port-forwarding
- **ipv6-first** with ipv4 fallback - **IPv6-first** with IPv4 fallback
- can **use proxy**, like tor - Can **use a proxy**, like Tor
For more information about `croc`, see [my blog post](https://schollz.com/software/croc6) or read a [recent interview I did](https://console.substack.com/p/console-91). For more information about `croc`, see [my blog post](https://schollz.com/tinker/croc6/) or read a [recent interview I did](https://console.substack.com/p/console-91).
![Example](src/install/customization.gif) ![Example](src/install/customization.gif)
## Install ## Install
Download [the latest release for your system](https://github.com/schollz/croc/releases/latest), or install a release from the command-line: You can download [the latest release for your system](https://github.com/schollz/croc/releases/latest), or install a release from the command-line:
``` ```bash
curl https://getcroc.schollz.com | bash curl https://getcroc.schollz.com | bash
``` ```
### On macOS
On macOS you can install the latest release with [Homebrew](https://brew.sh/): Using [Homebrew](https://brew.sh/):
```bash
brew install croc
```
``` Using [MacPorts](https://www.macports.org/):
brew install croc ```bash
``` sudo port selfupdate
sudo port install croc
```
On macOS you can also install the latest release with [MacPorts](https://macports.org/): ### On Windows
``` You can install the latest release with [Scoop](https://scoop.sh/), [Chocolatey](https://chocolatey.org/), or [Winget](https://learn.microsoft.com/windows/package-manager/):
sudo port selfupdate
sudo port install croc
```
On Windows you can install the latest release with [Scoop](https://scoop.sh/), [Chocolatey](https://chocolatey.org), or [Winget](https://learn.microsoft.com/en-us/windows/package-manager/):
```bash ```bash
scoop install croc scoop install croc
@ -61,74 +66,92 @@ choco install croc
winget install schollz.croc winget install schollz.croc
``` ```
On Unix you can install the latest release with [Nix](https://nixos.org/nix): ### On Unix
You can install the latest release with [Nix](https://nixos.org/):
```bash ```bash
nix-env -i croc nix-env -i croc
``` ```
### On Alpine Linux
On Alpine Linux you have to install dependencies first: First, install dependencies:
```bash ```bash
apk add bash coreutils apk add bash coreutils
wget -qO- https://getcroc.schollz.com | bash wget -qO- https://getcroc.schollz.com | bash
``` ```
On Arch Linux you can install the latest release with `pacman`: ### On Arch Linux
Install with `pacman`:
```bash ```bash
pacman -S croc pacman -S croc
``` ```
On Fedora you can install with `dnf`: ### On Fedora
Install with `dnf`:
```bash ```bash
dnf install croc dnf install croc
``` ```
On Gentoo you can install with `portage`: ### On Gentoo
Install with `portage`:
```bash ```bash
emerge net-misc/croc emerge net-misc/croc
``` ```
On Termux you can install with `pkg`: ### On Termux
Install with `pkg`:
```bash ```bash
pkg install croc pkg install croc
``` ```
On FreeBSD you can install with `pkg`: ### On FreeBSD
Install with `pkg`:
```bash ```bash
pkg install croc pkg install croc
``` ```
On Linux, macOS, and Windows you can install from [conda-forge](https://github.com/conda-forge/croc-feedstock/) globally with [`pixi`](https://pixi.sh/): ### On Linux, macOS, and Windows via Conda
You can install from [conda-forge](https://github.com/conda-forge/croc-feedstock) globally with [`pixi`](https://pixi.sh/):
```bash ```bash
pixi global install croc pixi global install croc
``` ```
or into a particular environment with [`conda`](https://docs.conda.io/projects/conda/): Or install into a particular environment with [`conda`](https://docs.conda.io/projects/conda/):
```bash ```bash
conda install --channel conda-forge croc conda install --channel conda-forge croc
``` ```
Or, you can [install Go](https://golang.org/dl/) and build from source (requires Go 1.17+): ### Build from Source
If you prefer, you can [install Go](https://go.dev/dl/) and build from source (requires Go 1.17+):
```bash ```bash
go install github.com/schollz/croc/v10@latest go install github.com/schollz/croc/v10@latest
``` ```
On Android there is a 3rd party F-Droid app [available to download](https://f-droid.org/en/packages/com.github.howeyc.crocgui/). ### On Android
There is a 3rd-party F-Droid app [available to download](https://f-droid.org/packages/com.github.howeyc.crocgui/).
## Usage ## Usage
To send a file, simply do: To send a file, simply do:
```bash ```bash
$ croc send [file(s)-or-folder] $ croc send [file(s)-or-folder]
@ -136,62 +159,55 @@ Sending 'file-or-folder' (X MB)
Code is: code-phrase Code is: code-phrase
``` ```
Then to receive the file (or folder) on another computer, you can just do Then, to receive the file (or folder) on another computer, run:
``` ```bash
croc code-phrase croc code-phrase
``` ```
The code phrase is used to establish password-authenticated key agreement ([PAKE](https://en.wikipedia.org/wiki/Password-authenticated_key_agreement)) which generates a secret key for the sender and recipient to use for end-to-end encryption. The code phrase is used to establish password-authenticated key agreement ([PAKE](https://en.wikipedia.org/wiki/Password-authenticated_key_agreement)) which generates a secret key for the sender and recipient to use for end-to-end encryption.
There are a number of configurable options (see `--help`). A set of options (like custom relay, ports, and code phrase) can be set using `--remember`. ### Customizations & Options
### Using `croc` on Linux or Mac OS #### Using `croc` on Linux or macOS
On Linux and Mac OS, the sending & receiving is slightly different to avoid [leaking the secret via the process name](https://nvd.nist.gov/vuln/detail/CVE-2023-43621). On these systems you will need to run `croc` with the secret as an environment variable. For example, to receive with the secret `***`: On Linux and macOS, the sending and receiving process is slightly different to avoid [leaking the secret via the process name](https://nvd.nist.gov/vuln/detail/CVE-2023-43621). You will need to run `croc` with the secret as an environment variable. For example, to receive with the secret `***`:
```bash ```bash
CROC_SECRET=*** croc CROC_SECRET=*** croc
``` ```
This will show only `croc` in the process list of a multi-user system and not leak the secret. For single-user systems, the default behavior can be permanently enabled by running:
For a single-user system the default behavior can be permanently enabled by running
```bash ```bash
croc --classic croc --classic
``` ```
and confirming. #### Custom Code Phrase
Run this command again to disable classic mode.
### Custom code phrase You can send with your own code phrase (must be more than 6 characters):
You can send with your own code phrase (must be more than 6 characters).
```bash ```bash
croc send --code [code-phrase] [file(s)-or-folder] croc send --code [code-phrase] [file(s)-or-folder]
``` ```
### Allow overwriting without prompt #### Allow Overwriting Without Prompt
By default, croc will prompt whether to overwrite a file. You can automatically overwrite files by using the `--overwrite` flag (recipient only). For example, receive a file to automatically overwrite: To automatically overwrite files without prompting, use the `--overwrite` flag:
```bash ```bash
croc --yes --overwrite <code> croc --yes --overwrite <code>
``` ```
### Excluding folders #### Excluding Folders
You can exclude folders from being sent by using the `--exclude` flag with a string of comma-delimited exclusions. For example, if you want to send a folder but exclude any `node_modules` folders or `.venv` folders: To exclude folders from being sent, use the `--exclude` flag with comma-delimited exclusions:
```bash ```bash
croc send --exclude "node_modules,.venv" [folder] croc send --exclude "node_modules,.venv" [folder]
``` ```
Exclusions work by excluding any absolute path that contains the string. So in the above example, any folder named `node_modules` or `.venv` will be excluded from the transfer. #### Use Pipes - stdin and stdout
### Use pipes - stdin and stdout
You can pipe to `croc`: You can pipe to `croc`:
@ -199,93 +215,80 @@ You can pipe to `croc`:
cat [filename] | croc send cat [filename] | croc send
``` ```
In this case `croc` will automatically use the stdin data and send and assign a filename like "croc-stdin-123456789". To receive to `stdout` at you can always just use the `--yes` will automatically approve the transfer and pipe it out to `stdout`. To receive the file to `stdout`, you can use:
```bash ```bash
croc --yes [code-phrase] > out croc --yes [code-phrase] > out
``` ```
All of the other text printed to the console is going to `stderr` so it will not interfere with the message going to `stdout`. #### Send Text
To send URLs or short text, use:
### Send text
Sometimes you want to send URLs or short text. In addition to piping, you can easily send text with `croc`:
```bash ```bash
croc send --text "hello world" croc send --text "hello world"
``` ```
This will automatically tell the receiver to use `stdout` when they receive the text so it will be displayed. #### Use a Proxy
You can send files via a proxy by adding `--socks5`:
### Use a proxy
You can use a proxy as your connection to the relay by adding a proxy address with `--socks5`. For example, you can send via a tor relay:
```bash ```bash
croc --socks5 "127.0.0.1:9050" send SOMEFILE croc --socks5 "127.0.0.1:9050" send SOMEFILE
``` ```
### Change encryption curve #### Change Encryption Curve
You can choose from several different elliptic curves to use for encryption by using the `--curve` flag. Only the recipient can choose the curve. For example, receive a file using the P-521 curve: To choose a different elliptic curve for encryption, use the `--curve` flag:
```bash ```bash
croc --curve p521 <codephrase> croc --curve p521 <codephrase>
``` ```
Available curves are P-256, P-348, P-521 and SIEC. P-256 is the default curve. #### Change Hash Algorithm
### Change hash algorithm For faster hashing, use the `imohash` algorithm:
You can choose from several different hash algorithms. The default is the `xxhash` algorithm which is fast and thorough. If you want to optimize for speed you can use the `imohash` algorithm which is even faster, but since it samples files (versus reading the whole file) it can mistakenly determine that a file is the same on the two computers transferring - though this is only a problem if you are syncing files versus sending a new file to a computer.
```bash ```bash
croc send --hash imohash SOMEFILE croc send --hash imohash SOMEFILE
``` ```
### Self-host relay #### Self-host Relay
The relay is needed to staple the parallel incoming and outgoing connections. By default, `croc` uses a public relay but you can also run your own relay: You can run your own relay:
```bash ```bash
croc relay croc relay
``` ```
By default it uses TCP ports 9009-9013. Make sure to open those up. You can customize the ports (e.g. `croc relay --ports 1111,1112`), but you must have a minimum of **2** ports for the relay. The first port is for communication and the subsequent ports are used for the multiplexed data transfer. By default, it uses TCP ports 9009-9013. You can customize the ports (e.g., `croc relay --ports 1111,1112`), but at least **2** ports are required.
You can send files using your relay by entering `--relay` to change the relay that you are using if you want to custom host your own. To send files using your relay:
```bash ```bash
croc --relay "myrelay.example.com:9009" send [filename] croc --relay "myrelay.example.com:9009" send [filename]
``` ```
Note, when sending, you only need to include the first port (the communication port). The subsequent ports for data transfer will be transmitted back to the user from the relay. #### Self-host Relay with Docker
#### Self-host relay (docker)
If it's easier you can also run a relay with Docker:
You can also run a relay with Docker:
```bash ```bash
docker run -d -p 9009-9013:9009-9013 -e CROC_PASS='YOURPASSWORD' schollz/croc docker run -d -p 9009-9013:9009-9013 -e CROC_PASS='YOURPASSWORD' schollz/croc
``` ```
Be sure to include the password for the relay otherwise any requests will be rejected. To send files using your custom relay:
```bash ```bash
croc --pass YOURPASSWORD --relay "myreal.example.com:9009" send [filename] croc --pass YOURPASSWORD --relay "myreal.example.com:9009" send [filename]
``` ```
Note: when including `--pass YOURPASSWORD` you can instead pass a file with the password, e.g. `--pass FILEWITHPASSWORD`.
## License
MIT
## Acknowledgements ## Acknowledgements
`croc` has gone through many iterations, and I am awed by all the great contributions! If you feel like contributing, in any way, by all means you can send an Issue, a PR, or ask a question. `croc` has evolved through many iterations, and I am thankful for the contributions! Special thanks to:
Thanks [@warner](https://github.com/warner) for the [idea](https://github.com/warner/magic-wormhole), [@tscholl2](https://github.com/tscholl2) for the [encryption gists](https://gist.github.com/tscholl2/dc7dc15dc132ea70a98e8542fefffa28), [@skorokithakis](https://github.com/skorokithakis) for [code on proxying two connections](https://www.stavros.io/posts/proxying-two-connections-go/). Finally thanks for making pull requests [@maximbaz](https://github.com/maximbaz), [@meyermarcel](https://github.com/meyermarcel), [@Girbons](https://github.com/Girbons), [@techtide](https://github.com/techtide), [@heymatthew](https://github.com/heymatthew), [@Lunsford94](https://github.com/Lunsford94), [@lummie](https://github.com/lummie), [@jesuiscamille](https://github.com/jesuiscamille), [@threefjord](https://github.com/threefjord), [@marcossegovia](https://github.com/marcossegovia), [@csleong98](https://github.com/csleong98), [@afotescu](https://github.com/afotescu), [@callmefever](https://github.com/callmefever), [@El-JojA](https://github.com/El-JojA), [@anatolyyyyyy](https://github.com/anatolyyyyyy), [@goggle](https://github.com/goggle), [@smileboywtu](https://github.com/smileboywtu), [@nicolashardy](https://github.com/nicolashardy), [@fbartels](https://github.com/fbartels), [@rkuprov](https://github.com/rkuprov), [@hreese](https://github.com/hreese), [@xenrox](https://github.com/xenrox) and [Ipar](https://github.com/lpar)! - [@warner](https://github.com/warner) for the [idea](https://github.com/magic-wormhole/magic-wormhole)
- [@tscholl2](https://github.com/tscholl2) for the [encryption gists](https://gist.github.com/tscholl2/dc7dc15dc132ea70a98e8542fefffa28)
- [@skorokithakis](https://github.com/skorokithakis) for [proxying two connections](https://www.stavros.io/posts/proxying-two-connections-go/)
And many more!